Degrees of Freedom S.J.T.U. Phase Transformation and Applications Page 6/45 在一定范围内独立变动而不致破坏多相平 衡的强度因素（温度、压力和组成等）的 数目 ·不考虑相的数量， 表面及表面能 SJTU Thermodynamics of Materials Spring2010©X.J.Jin Lecture 14 Phase Rule
Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2010 © X. J. Jin Lecture 14 Phase Rule Page 6/45 Degrees of Freedom • 在一定范围内独立变动而不致破坏多相平 衡的强度因素（温度、压力和组成等）的 数目 • 不考虑相的数量，表面及表面能
8.3 Specifying a System S.J.T.U. Phase Transformation and Applications Page 7/45 Intensive properties VAR:total number of variables to be specified AR=P(C-1)+2 C:components P:phase Not take account of following situations: ●Amount of each phase .Surfaces or surface energy SJTU Thermodynamics of Materials Spring2010©X.J.Jin Lecture 14 Phase Rule
Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2010 © X. J. Jin Lecture 14 Phase Rule Page 7/45 8.3 Specifying a System Intensive properties VAR: total number of variables to be specified Not take account of following situations: •Amount of each phase •Surfaces or surface energy VAR P(C 1) 2 C: components P: phase
8.4 Equilibrium Conditions S.J.T.U. Phase Transformation and Applications Page 8/45 Equilibrium conditions: The chemical potential (partial molar Gibbs free energy)of a component must be the same throughout the system Intensive properties 4=4=4=44=.=4 the chemical potential of component i in phase p The total number of relationship REL=C(P-1) SJTU Thermodynamics of Materials Spring 2010 ©X.J.Jin Lecture 14 Phase Rule
Phase Transformation and Applications S. J. T. U. SJTU Thermodynamics of Materials Spring 2010 © X. J. Jin Lecture 14 Phase Rule Page 8/45 8.4 Equilibrium Conditions Equilibrium conditions: The chemical potential (partial molar Gibbs free energy) of a component must be the same throughout the system. Intensive properties REL C(P1) p i i i i i ... 1 2 3 4 p i the chemical potential of component i in phase p The total number of relationship